EP0905965A2 - Tintenstrahlkopierer in welchem ein Original vorabgetasted wird für optimiertes Drucken - Google Patents

Tintenstrahlkopierer in welchem ein Original vorabgetasted wird für optimiertes Drucken Download PDF

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Publication number
EP0905965A2
EP0905965A2 EP98304078A EP98304078A EP0905965A2 EP 0905965 A2 EP0905965 A2 EP 0905965A2 EP 98304078 A EP98304078 A EP 98304078A EP 98304078 A EP98304078 A EP 98304078A EP 0905965 A2 EP0905965 A2 EP 0905965A2
Authority
EP
European Patent Office
Prior art keywords
printhead
original image
image data
copy sheet
scanning
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98304078A
Other languages
English (en)
French (fr)
Other versions
EP0905965A3 (de
Inventor
Morton Silverberg
George J. Roller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xerox Corp
Original Assignee
Xerox Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xerox Corp filed Critical Xerox Corp
Publication of EP0905965A2 publication Critical patent/EP0905965A2/de
Publication of EP0905965A3 publication Critical patent/EP0905965A3/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/23—Reproducing arrangements
    • H04N1/2307—Circuits or arrangements for the control thereof, e.g. using a programmed control device, according to a measured quantity
    • H04N1/233—Circuits or arrangements for the control thereof, e.g. using a programmed control device, according to a measured quantity according to characteristics of the data to be reproduced, e.g. number of lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/17—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa the scanning speed being dependent on content of picture
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/23—Reproducing arrangements
    • H04N1/2307—Circuits or arrangements for the control thereof, e.g. using a programmed control device, according to a measured quantity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/23—Reproducing arrangements
    • H04N1/2307—Circuits or arrangements for the control thereof, e.g. using a programmed control device, according to a measured quantity
    • H04N1/2369—Selecting a particular reproducing mode from amongst a plurality of modes, e.g. paper saving or normal, or simplex or duplex
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/04—Scanning arrangements
    • H04N2201/0402—Arrangements not specific to a particular one of the scanning methods covered by groups H04N1/04 - H04N1/207
    • H04N2201/0416—Performing a pre-scan

Definitions

  • the present invention relates to ink-jet digital printing in which the original image to be printed is derived from a hard-copy original placed on a platen, as in a copier.
  • droplets of ink are collectively emitted from a plurality of drop ejectors in a printhead, in accordance with digital instructions, to create a desired image on a sheet.
  • the printhead is relatively small compared to the size of a sheet on which an image is printed, and the printhead is caused to reciprocate relative to the sheet, with the sheet being indexed a short distance with every pass, or following a certain number of passes, of the printhead.
  • any small advantage in improving the speed of outputting sheets is desirable.
  • One well-known technique familiar in the art of ink-jet printing is called "white space skipping.” With white space skipping, any "white" areas in the image (i.e., portions of an image in which no ink is intended to be placed) are pre-identified from the original image data, and can thus be skipped entirely by the moving printhead.
  • any white space at the top or the bottom of the image can simply be passed through the apparatus quickly without the printhead passing over these areas at all.
  • the printhead can be caused to change direction before reaching the end of the sheet.
  • the printhead need not pass over that part of the sheet having only white area, or, alternately, the printhead can pass over the white space at a speed higher than would be suitable if the printhead were depositing ink in the area; for purposes of the claims hereinbelow, either technique can fall under the rubric of "skipping."
  • White space skipping is made possible in the context of printing an image based on original data derived from a computer, because this digital data will inherently hold "clues" which the control system of the printer can use to detect large white spaces in the image to be printed.
  • page description languages such as PostScript TM
  • facsimile protocols such as Group 3, or in some cases JPEG-compressed data
  • markers can be exploited to cause the printhead to skip certain areas.
  • the problem with such original image data is that, unlike computer-originated images, the data inherently includes no "clues" to facilitate white-space skipping when the copies are printed.
  • An object of the present invention is to provide a system which enables the speed advantages of white-spaced skipping in an ink-jet-based copier.
  • US patent 3,769,631 is an early ink-jet-printing patent which describes the general principle of "white-space skipping.”
  • US patent 5,414,453 discloses a color ink-jet printing apparatus in which the reciprocating printhead can be moved to a first position relative to the paper for all-black printing, and to a second position for full-color printing.
  • the printhead position is controlled by monitoring the image data to detect where black-only and full-color portions of the images are disposed; this detection is carried out by dividing the image data by a grid which separates the image into small areas, as described at column 10, lines 36-52.
  • US patent 5,519,514 discloses a color photosensor array for scanning documents, in which different arrays, each sensitive to a different primary color, have different integration times, i.e., exposure time relative to a small area of the original image, so that the optical "center of gravity" for each exposed area in the original image is superimposed for all of the primary color photosensor arrays.
  • US patent 5,532,839 discloses an input scanner, such as for a digital copier, which allows for the elimination of scanning duplicate images within a single job. Duplicate images are detected by performing a checksum operation on certain cell areas within the original image data.
  • US patent 5,550,653 discloses an input scanner adapted for efficient scanning of simple "business color” documents.
  • Three linear arrays of photosensors, each corresponding to one primary color, are moved relative to the original image.
  • One linear array operates on a full cycle and converts every single scan line of the original image into digital signals, while the other linear arrays operate on half cycles and record only signals corresponding to an evenly-distributed subset of small areas of the original image.
  • US patent 5,563,591 discloses an ink-jet printing appartaus having a reciprocating printhead in which a an encoder panel includes fiducial marks which are monitored by a photosensor on the printhead, to control the precise position and motion of the printhead.
  • the encoder panel is itself in the form of an LCD display, which enables the fiducial marks to be altered as needed to control the printhead behavior, such as for white-space skipping.
  • a method of operating a digital copier having an input scanner for scanning an original image, an ink-jet printhead, and a printhead control for moving the printhead relative to a copy sheet and causing the printhead to deposit ink at a predetermined location on the copy sheet.
  • the original image is scanned to yield low-resolution image data. Based on the low-resolution image data, areas of contiguous white space of a predetermined minimal size in the original image are identified.
  • the original image is further scanned to yield high-resolution image data.
  • a copy of the original image is printed on the copy sheet with the printhead, based on the high-resolution image data.
  • the printhead control causes the printhead to skip a location on the copy sheet corresponding to an identified area of contiguous white space of a predetermined minimal size in the original image.
  • a method of operating a digital copier having an input scanner for scanning an original image, an ink-jet printhead, and a printhead control for moving the printhead relative to a copy sheet and causing the printhead to deposit ink at a predetermined location on the copy sheet, the printhead control further adapted to selectably cause the printhead to pass a predetermined number of times over an area of the copy sheet to render an image thereon.
  • the original image is scanned to yield low-resolution image data.
  • an area of contiguous space of a predetermined minimal size in the original image is identified, said area of contiguous space requiring the printhead to pass fewer than said predetermined number of times over a location on the copy sheet to render the image in the area on the copy sheet.
  • the original image is further scanned to yield high-resolution image data.
  • a copy of the original image is printed on the copy sheet with the printhead, based on the high-resolution image data.
  • the printhead control causes the printhead to pass fewer than said predetermined number of times over a location on the copy sheet corresponding to the area of contiguous space in the original image.
  • an input scanner typically includes a sensor array 11, such as a charge-coupled device (CCD) or CMOS sensor array, which typically includes a linear array of photosensors 40 for sampling the reflected light from a large set of small areas of an original sheet to be copied, such as known in the art of facsimile or multifunction devices.
  • a sensor array such as a charge-coupled device (CCD) or CMOS sensor array, which typically includes a linear array of photosensors 40 for sampling the reflected light from a large set of small areas of an original sheet to be copied, such as known in the art of facsimile or multifunction devices.
  • the printhead control 12 which controls both the ejection of droplets from a printhead and incidentally one or more motors which control the position of the printhead relative to a sheet, is generally familiar in the art of ink-jet printing.
  • stepper motors 30, 32 which control respectively the paper position and printhead position for a printhead depositing ink on a location on a copy sheet, i.e., the x,y location of the printhead relative to the sheet at a given time.
  • an original document to be copied is scanned by input scanner 10.
  • the original document is scanned twice, first in what is here called a "pre-scan," and then subsequently in detail.
  • the purpose of the pre-scan is to quickly identify any white spaces larger than a predetermined area in the original image, which could result in image data eligible for "white-space skipping" to increase speed in the final printing step.
  • the pre-scan image data derived from input scanner 10 is of low resolution, so that the original image can be pre-scanned at a maximum possible speed.
  • the sensor array 11 in input scanner 10 pre-scans the original image at a resolution of only 25 spots per inch, as compared to, for example, the 400 spots per inch resolution of typical digital-copier-quality scanning.
  • This low-resolution image data can be obtained by sampling an evenly-distributed subset of sensors in the sensor array corresponding to the low resolution.
  • the sensor array 11 in input scanner 10 can be moved at a fairly high speed relative to the original image, such as from 20-30 inches per second.
  • the purpose of this highspeed, low-resolution scanning is to retain just enough low-resolution image data in pre-scan memory 14 to determine whether there are any significantly large areas of contiguous white space in the original image.
  • the detection of such white spaces is carried out by a white-space detection algorithm 16.
  • the details of the operation of such an algorithm may vary depending on particular circumstances, but basically, the function of the white-space detection algorithm 16 is to locate a sufficiently large number of contiguous low-resolution pixel areas in the original image to be indicative of a significant area of white space.
  • the presence of a certain number of black pixel areas will of course be indicative of information-bearing image areas, such as text and of course text will include a significant proportion of white-space, so of course certain statistical properties of text must be taken into account when deciding whether a certain area is white space.
  • CMOS complementary metal-oxide-semiconductor
  • CMOS complementary metal-oxide-semiconductor
  • the original image is scanned again by input scanner 10.
  • the image data is recorded in detail at high (200-to-600-spi) resolution, in order to accurately render the image.
  • This high-resolution scan can then yield data which is entered into an image processing system 20, which typically converts the original image data (which may include, for example, halftone data) into data which is more directly operative of an ink-jet printhead (such as incorporating, for example, error diffusion or dithering techniques).
  • This "printhead-ready" data can then be stored in a buffer 22 until required by the printhead control 10.
  • the white-space skipping algorithm 18 can be effectively applied to the data.
  • the white-space skipping algorithm can be applied to the copier data in the present context in a variety of ways.
  • the image-processing system 20 can convert the original image data to an image format which simulates computer originated printing data such as, for example, a TIFF file, facsimile file, or JPEG-compressed data.
  • image formats may include provision for adding "markers" at selected portions of the data, where directions for initiating a skipping algorithm would be readily incorporated.
  • Another technique for white-space skipping is to allow the skipping algorithm to react to the precise location of the printhead relative to the print sheet at a specific particular time in the printing process: the known locations of white spaces derived from the white-space detection algorithm 16 can be constantly compared to the instantaneous location of the printhead derived from printhead control 12 (note that the printhead control 12 can feed back the x,y coordinates of the printhead location, such as determined by the position of stepper motors 30, 32, to the skipping algorithm 18) and, where the printhead position approaches the location of skippable white-space, a white-space-skipping sequence can be initiated.
  • Such a white-space skipping sequence may include changing the printhead direction before the printhead reaches the end of the sheet, or advancing the print sheet relative to the printhead without reciprocating the printhead, such as at the end of a printed text document. These techniques will increase the throughput speed of printing the desired page image.
  • the pre-scanning and scanning steps could be performed not with the same input scanner apparatus, but there could be provided two sensor arrays, a low-resolution array and a high-resolution array, over which the original document passes sequentially.
  • the pre-scanning and scanning steps could be performed simultaneously with one sensor array, with the pre-scan memory 16 "tapping" into a certain subset of sensors in the array via hardware such as 42, to obtain the necessary low-resolution image data.
  • Another type of variation to the above-described technique would be to employ a version of white-space skipping to situations which require multiple passes of a printhead over areas of a sheet intended to have certain types of images.
  • the "normal" operation of the printer includes causing the printhead to pass twice over each area having a halftone image (such as to prevent excessive ink bleeding), or in a color printer in which a multi-color printhead must pass many times over the same area to lay down multiple primary-color inks
  • the pre-scan step could generally identify either areas having halftone images, or areas having color images. Then, areas which are neither halftone or color (such as black text) can be printed without multiple passes of the printhead over the area.
  • the concept of "white space skipping" can thus apply to extra passes of a printhead over areas of the image to be copied which do not require these extra passes of the printhead.
  • the low-resolution scan could include comparing signals from different primary-color-sensitive photosensors in array 11 to determine that all of the pixel-sized areas in a certain small area are all of one color; or, if the array is capable of adjusting the exposure or integration time of the photosensors, a halftone could be detected by detecting areas which are consistently within a certain range of reflectivity which would be close to neither all-white or all-black.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Fax Reproducing Arrangements (AREA)
EP98304078A 1997-08-22 1998-05-22 Tintenstrahlkopierer in welchem ein Original vorabgetasted wird für optimiertes Drucken Withdrawn EP0905965A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/916,499 US6016205A (en) 1997-08-22 1997-08-22 Ink-jet copier in which an original image is prescanned for optimized printing
US916499 1997-08-22

Publications (2)

Publication Number Publication Date
EP0905965A2 true EP0905965A2 (de) 1999-03-31
EP0905965A3 EP0905965A3 (de) 1999-07-21

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EP98304078A Withdrawn EP0905965A3 (de) 1997-08-22 1998-05-22 Tintenstrahlkopierer in welchem ein Original vorabgetasted wird für optimiertes Drucken

Country Status (3)

Country Link
US (1) US6016205A (de)
EP (1) EP0905965A3 (de)
JP (1) JPH11138790A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001093564A1 (en) * 2000-05-29 2001-12-06 Olivetti Tecnost S.P.A. Device and method for printing figures and data fields from a video
WO2006000217A2 (en) * 2004-06-25 2006-01-05 Esko-Graphics A/S Method and system for exposing an area according to digital image data
EP1591262A3 (de) * 2004-04-28 2007-07-11 Ricoh Company Tintenstrahlaufzeichnungsvorrichtung, Steuerungsverfahren für Computerprogramm und computerlesbares Speichermedium
EP2105007A1 (de) * 2007-08-20 2009-09-30 Vistaprint Technologies Limited Bildverarbeitung zur reduzierung der bildausdruckzeit
CN114590048A (zh) * 2022-03-09 2022-06-07 东莞市图创智能制造有限公司 往复式扫描打印方法、装置、设备及介质
CN116587737A (zh) * 2023-05-25 2023-08-15 苏州戎图科技有限公司 一种基于内容预测的喷墨打印机打印提速方法

Families Citing this family (11)

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US6585342B1 (en) 2000-11-13 2003-07-01 Xerox Corporation Object oriented images forming
US7034317B2 (en) * 2002-12-17 2006-04-25 Dmetrix, Inc. Method and apparatus for limiting scanning imaging array data to characteristics of interest
US20040126011A1 (en) * 2002-12-27 2004-07-01 Chung-Wei Cheng Image scanning method
US7551323B2 (en) * 2003-04-16 2009-06-23 Lexmark International, Inc. Systems and methods for error diffusion
US7667870B1 (en) * 2004-01-09 2010-02-23 Conexant Systems, Inc. White region identification to accelerate image processing for copies
US20050226503A1 (en) * 2004-04-07 2005-10-13 Bailey James R Scanned image content analysis
US20060044590A1 (en) * 2004-08-30 2006-03-02 Sharp Laboratories Of America Inc. System and method for network scan debt authorization
JP4781063B2 (ja) * 2005-09-14 2011-09-28 キヤノン株式会社 画像処理装置及びその制御方法
JP2007082129A (ja) * 2005-09-16 2007-03-29 Ricoh Co Ltd 画像形成装置
JP4924340B2 (ja) * 2007-09-28 2012-04-25 セイコーエプソン株式会社 印刷装置、印刷方法および印刷プログラム
JP5728948B2 (ja) * 2011-01-06 2015-06-03 セイコーエプソン株式会社 記録システム、記録システムの制御方法、記録制御装置、および、プログラム

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EP0785666A2 (de) * 1996-01-17 1997-07-23 Fuji Photo Film Co., Ltd. Mikrofilmabtaster und Steuerverfahren dazu

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US3428744A (en) * 1965-07-14 1969-02-18 Xerox Corp Facsimile line skipping system
US3769631A (en) * 1972-10-13 1973-10-30 Ibm Increasing throughput in ink jet printing by drop skipping and reducing ink jet merging and splatter using a stairstep generator
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US3730988A (en) * 1970-07-29 1973-05-01 Pioneer Electronic Corp Electronic transmission system of static picture writings
US4302781A (en) * 1978-04-03 1981-11-24 Hitachi, Ltd. Facsimile system
EP0079208A2 (de) * 1981-11-06 1983-05-18 Fuji Xerox Co., Ltd. Bilddatenaufzeichnungsanlage
US4631598A (en) * 1984-10-15 1986-12-23 Burkhardt Norman S High speed, high resolution image processing system
DE3540875A1 (de) * 1984-11-19 1986-05-28 Canon K.K., Tokio/Tokyo Bildreproduktionsgeraet
EP0655854A1 (de) * 1993-11-30 1995-05-31 Canon Kabushiki Kaisha Bildübertragungsgerät
EP0785666A2 (de) * 1996-01-17 1997-07-23 Fuji Photo Film Co., Ltd. Mikrofilmabtaster und Steuerverfahren dazu

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001093564A1 (en) * 2000-05-29 2001-12-06 Olivetti Tecnost S.P.A. Device and method for printing figures and data fields from a video
EP1591262A3 (de) * 2004-04-28 2007-07-11 Ricoh Company Tintenstrahlaufzeichnungsvorrichtung, Steuerungsverfahren für Computerprogramm und computerlesbares Speichermedium
WO2006000217A2 (en) * 2004-06-25 2006-01-05 Esko-Graphics A/S Method and system for exposing an area according to digital image data
WO2006000217A3 (en) * 2004-06-25 2006-02-09 Esko Graphics As Method and system for exposing an area according to digital image data
EP2105007A1 (de) * 2007-08-20 2009-09-30 Vistaprint Technologies Limited Bildverarbeitung zur reduzierung der bildausdruckzeit
CN114590048A (zh) * 2022-03-09 2022-06-07 东莞市图创智能制造有限公司 往复式扫描打印方法、装置、设备及介质
CN116587737A (zh) * 2023-05-25 2023-08-15 苏州戎图科技有限公司 一种基于内容预测的喷墨打印机打印提速方法
CN116587737B (zh) * 2023-05-25 2023-10-20 苏州戎图科技有限公司 一种基于内容预测的喷墨打印机打印提速方法

Also Published As

Publication number Publication date
JPH11138790A (ja) 1999-05-25
US6016205A (en) 2000-01-18
EP0905965A3 (de) 1999-07-21

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